# SDR ASAA2017010719247

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 7, 2017
- Submitted: January 9, 2017
- Operation: Air carrier
- Aircraft: [N423AS](https://openairdocs.org/aircraft/N423AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35206
- Aircraft time: 14,741 hours, 4,819 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 19237
- Condition: Faulted
- Location: Lt A/C Pack
- Part time: 14,763 hours, 4,828 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017010719247

## Discrepancy

ON RECALL, RT PACK LIGHT ANNUNCIATOR ILLUMINATED, EXTINGUISHED ON SYSTEM RESET.  ACFT GROUNDED. ACCOMPLISHED PACK TEMP CONTROL BITE PROCEDURE. NR 1 TEMP CONTROL TEST PASSED NO FAULTS NOTED. NR 2 TEMP CONTROL SHOWED TCV FAULT IAW FIM 21-62 TASK 801.  ACCOMPLISHED RIGHT TEMP CONTROL VALVE FAULT ISOLATION, FOUND TEMP VALVE STICKING DURING OPERATION.  IAW FIM 21-62 TASK 831, REMOVED AND REPLACED THE RT PACK TEMP CONTROL VALVE.  OPS AND LEAK CHECKED GOOD IAW AMM 21-51-10-000-801 AND 21-51-10-400-801.   ACCOMPLISHED PACK TEMP CONTROL BITE TEST GROUND VERIFICATION, CHECKED GOOD.  NO FAULTS NOTED ON NR 2 TEMP CONTROLLER IAW FIM 21-62 TASK 801.

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